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What is Weather?01:07

What is Weather?

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Overview
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Hot Weather Concreting01:20

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Concreting at elevated temperatures accelerates the hydration process, leading to quicker setting but potentially reducing the long-term strength of the concrete structure. Additionally, low air humidity fosters rapid moisture loss from the concrete, resulting in reduced workability, pronounced plastic shrinkage, and a higher likelihood of crazing.
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Cold Weather Concreting01:27

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When freshly poured concrete is exposed to freezing temperatures before it has set, the water within the concrete can freeze. This expansion disrupts the setting process, delays chemical reactions necessary for hardening, and increases the volume of pores within the hardened concrete, which weakens its overall structure. If the concrete manages to reach an appreciable strength before it freezes, the damage can be somewhat mitigated.
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Impact of Groups on Groups01:19

Impact of Groups on Groups

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Social psychologists analyze how groups influence one another, shaping social structures and interactions through both cooperation and competition. These dynamics manifest in various ways, ranging from economic partnerships to intergroup conflicts that shape societal structures and perceptions.Cooperation and Competition in Intergroup RelationsIntergroup relationships vary across contexts, sometimes fostering cooperation and mutual benefit while at other times leading to conflict and...
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Masonry in Cold and Hot Weather Conditions01:21

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In cold weather, masonry construction requires specific precautions to ensure mortar does not freeze before curing, as this can significantly weaken its strength and watertightness. Mortar temperature should be maintained between 60°F and 80°F to support proper hydration and curing. Below 40°F, mortar water must be heated, but should not exceed 120°F as high temperatures can reduce mortar's compressive and bond strength.
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Impact01:30

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Impact occurs when two bodies collide, leading to the application of impulsive forces between them. Analyzing impact mechanics involves considering two colliding particles moving along a line known as the line of impact, which passes through their centers and is perpendicular to the contact plane.
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Weather impacts expressed sentiment.

Patrick Baylis1, Nick Obradovich2, Yury Kryvasheyeu3

  • 1Vancouver School of Economics, University of British Columbia, Vancouver, British Columbia, Canada.

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|April 26, 2018
PubMed
Summary
This summary is machine-generated.

Weather impacts human emotions, with cold, heat, rain, and humidity linked to negative social media sentiment. This large-scale study reveals weather

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Area of Science:

  • Computational social science
  • Environmental psychology
  • Sentiment analysis

Background:

  • Understanding the influence of environmental factors on human behavior is crucial.
  • Social media provides a vast dataset for analyzing public sentiment.
  • Previous research has explored weather's impact on mood, but not at this scale.

Purpose of the Study:

  • To investigate the relationship between meteorological conditions and human sentiment expressed on social media.
  • To quantify the impact of various weather parameters on sentiment.
  • To compare weather's effect size with historical events.

Main Methods:

  • Analysis of over 3.5 billion social media posts (Facebook and Twitter) from 2009-2016.
  • Utilizing advanced sentiment analysis techniques.
  • Statistical comparison of weather effects with event-based sentiment shifts.

Main Results:

  • Cold and hot temperatures, precipitation, reduced daily temperature ranges, humidity, and cloud cover are associated with negative sentiment.
  • These weather effects persist even when excluding weather-related posts.
  • The magnitude of weather's impact is comparable to significant historical events.

Conclusions:

  • Meteorological conditions significantly influence human sentiment expressed online.
  • Weather is a pervasive factor affecting emotional well-being on a large scale.
  • This research highlights the interconnectedness of environment and human expression.